Commit | Line | Data |
---|---|---|
fbff949e | 1 | #include <linux/kernel.h> |
0744dd00 | 2 | #include <linux/skbuff.h> |
c452ed70 | 3 | #include <linux/export.h> |
0744dd00 ED |
4 | #include <linux/ip.h> |
5 | #include <linux/ipv6.h> | |
6 | #include <linux/if_vlan.h> | |
7 | #include <net/ip.h> | |
ddbe5032 | 8 | #include <net/ipv6.h> |
f77668dc DB |
9 | #include <linux/igmp.h> |
10 | #include <linux/icmp.h> | |
11 | #include <linux/sctp.h> | |
12 | #include <linux/dccp.h> | |
0744dd00 ED |
13 | #include <linux/if_tunnel.h> |
14 | #include <linux/if_pppox.h> | |
15 | #include <linux/ppp_defs.h> | |
06635a35 | 16 | #include <linux/stddef.h> |
67a900cc | 17 | #include <linux/if_ether.h> |
b3baa0fb | 18 | #include <linux/mpls.h> |
1bd758eb | 19 | #include <net/flow_dissector.h> |
56193d1b | 20 | #include <scsi/fc/fc_fcoe.h> |
0744dd00 | 21 | |
20a17bf6 DM |
22 | static bool dissector_uses_key(const struct flow_dissector *flow_dissector, |
23 | enum flow_dissector_key_id key_id) | |
fbff949e JP |
24 | { |
25 | return flow_dissector->used_keys & (1 << key_id); | |
26 | } | |
27 | ||
20a17bf6 DM |
28 | static void dissector_set_key(struct flow_dissector *flow_dissector, |
29 | enum flow_dissector_key_id key_id) | |
fbff949e JP |
30 | { |
31 | flow_dissector->used_keys |= (1 << key_id); | |
32 | } | |
33 | ||
34 | static void *skb_flow_dissector_target(struct flow_dissector *flow_dissector, | |
35 | enum flow_dissector_key_id key_id, | |
36 | void *target_container) | |
37 | { | |
38 | return ((char *) target_container) + flow_dissector->offset[key_id]; | |
39 | } | |
40 | ||
41 | void skb_flow_dissector_init(struct flow_dissector *flow_dissector, | |
42 | const struct flow_dissector_key *key, | |
43 | unsigned int key_count) | |
44 | { | |
45 | unsigned int i; | |
46 | ||
47 | memset(flow_dissector, 0, sizeof(*flow_dissector)); | |
48 | ||
49 | for (i = 0; i < key_count; i++, key++) { | |
50 | /* User should make sure that every key target offset is withing | |
51 | * boundaries of unsigned short. | |
52 | */ | |
53 | BUG_ON(key->offset > USHRT_MAX); | |
20a17bf6 DM |
54 | BUG_ON(dissector_uses_key(flow_dissector, |
55 | key->key_id)); | |
fbff949e | 56 | |
20a17bf6 | 57 | dissector_set_key(flow_dissector, key->key_id); |
fbff949e JP |
58 | flow_dissector->offset[key->key_id] = key->offset; |
59 | } | |
60 | ||
42aecaa9 TH |
61 | /* Ensure that the dissector always includes control and basic key. |
62 | * That way we are able to avoid handling lack of these in fast path. | |
fbff949e | 63 | */ |
20a17bf6 DM |
64 | BUG_ON(!dissector_uses_key(flow_dissector, |
65 | FLOW_DISSECTOR_KEY_CONTROL)); | |
66 | BUG_ON(!dissector_uses_key(flow_dissector, | |
67 | FLOW_DISSECTOR_KEY_BASIC)); | |
fbff949e JP |
68 | } |
69 | EXPORT_SYMBOL(skb_flow_dissector_init); | |
70 | ||
357afe9c | 71 | /** |
6451b3f5 WC |
72 | * __skb_flow_get_ports - extract the upper layer ports and return them |
73 | * @skb: sk_buff to extract the ports from | |
357afe9c NA |
74 | * @thoff: transport header offset |
75 | * @ip_proto: protocol for which to get port offset | |
6451b3f5 WC |
76 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
77 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
357afe9c NA |
78 | * |
79 | * The function will try to retrieve the ports at offset thoff + poff where poff | |
80 | * is the protocol port offset returned from proto_ports_offset | |
81 | */ | |
690e36e7 DM |
82 | __be32 __skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto, |
83 | void *data, int hlen) | |
357afe9c NA |
84 | { |
85 | int poff = proto_ports_offset(ip_proto); | |
86 | ||
690e36e7 DM |
87 | if (!data) { |
88 | data = skb->data; | |
89 | hlen = skb_headlen(skb); | |
90 | } | |
91 | ||
357afe9c NA |
92 | if (poff >= 0) { |
93 | __be32 *ports, _ports; | |
94 | ||
690e36e7 DM |
95 | ports = __skb_header_pointer(skb, thoff + poff, |
96 | sizeof(_ports), data, hlen, &_ports); | |
357afe9c NA |
97 | if (ports) |
98 | return *ports; | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } | |
690e36e7 | 103 | EXPORT_SYMBOL(__skb_flow_get_ports); |
357afe9c | 104 | |
453a940e WC |
105 | /** |
106 | * __skb_flow_dissect - extract the flow_keys struct and return it | |
107 | * @skb: sk_buff to extract the flow from, can be NULL if the rest are specified | |
06635a35 JP |
108 | * @flow_dissector: list of keys to dissect |
109 | * @target_container: target structure to put dissected values into | |
453a940e WC |
110 | * @data: raw buffer pointer to the packet, if NULL use skb->data |
111 | * @proto: protocol for which to get the flow, if @data is NULL use skb->protocol | |
112 | * @nhoff: network header offset, if @data is NULL use skb_network_offset(skb) | |
113 | * @hlen: packet header length, if @data is NULL use skb_headlen(skb) | |
114 | * | |
06635a35 JP |
115 | * The function will try to retrieve individual keys into target specified |
116 | * by flow_dissector from either the skbuff or a raw buffer specified by the | |
117 | * rest parameters. | |
118 | * | |
119 | * Caller must take care of zeroing target container memory. | |
453a940e | 120 | */ |
06635a35 JP |
121 | bool __skb_flow_dissect(const struct sk_buff *skb, |
122 | struct flow_dissector *flow_dissector, | |
123 | void *target_container, | |
cd79a238 TH |
124 | void *data, __be16 proto, int nhoff, int hlen, |
125 | unsigned int flags) | |
0744dd00 | 126 | { |
42aecaa9 | 127 | struct flow_dissector_key_control *key_control; |
06635a35 JP |
128 | struct flow_dissector_key_basic *key_basic; |
129 | struct flow_dissector_key_addrs *key_addrs; | |
130 | struct flow_dissector_key_ports *key_ports; | |
d34af823 | 131 | struct flow_dissector_key_tags *key_tags; |
1fdd512c | 132 | struct flow_dissector_key_keyid *key_keyid; |
8e690ffd | 133 | u8 ip_proto = 0; |
a6e544b0 | 134 | bool ret = false; |
0744dd00 | 135 | |
690e36e7 DM |
136 | if (!data) { |
137 | data = skb->data; | |
453a940e WC |
138 | proto = skb->protocol; |
139 | nhoff = skb_network_offset(skb); | |
690e36e7 DM |
140 | hlen = skb_headlen(skb); |
141 | } | |
142 | ||
42aecaa9 TH |
143 | /* It is ensured by skb_flow_dissector_init() that control key will |
144 | * be always present. | |
145 | */ | |
146 | key_control = skb_flow_dissector_target(flow_dissector, | |
147 | FLOW_DISSECTOR_KEY_CONTROL, | |
148 | target_container); | |
149 | ||
06635a35 JP |
150 | /* It is ensured by skb_flow_dissector_init() that basic key will |
151 | * be always present. | |
152 | */ | |
153 | key_basic = skb_flow_dissector_target(flow_dissector, | |
154 | FLOW_DISSECTOR_KEY_BASIC, | |
155 | target_container); | |
0744dd00 | 156 | |
20a17bf6 DM |
157 | if (dissector_uses_key(flow_dissector, |
158 | FLOW_DISSECTOR_KEY_ETH_ADDRS)) { | |
67a900cc JP |
159 | struct ethhdr *eth = eth_hdr(skb); |
160 | struct flow_dissector_key_eth_addrs *key_eth_addrs; | |
161 | ||
162 | key_eth_addrs = skb_flow_dissector_target(flow_dissector, | |
163 | FLOW_DISSECTOR_KEY_ETH_ADDRS, | |
164 | target_container); | |
165 | memcpy(key_eth_addrs, ð->h_dest, sizeof(*key_eth_addrs)); | |
166 | } | |
167 | ||
0744dd00 ED |
168 | again: |
169 | switch (proto) { | |
2b8837ae | 170 | case htons(ETH_P_IP): { |
0744dd00 ED |
171 | const struct iphdr *iph; |
172 | struct iphdr _iph; | |
173 | ip: | |
690e36e7 | 174 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
6f092343 | 175 | if (!iph || iph->ihl < 5) |
a6e544b0 | 176 | goto out_bad; |
3797d3e8 | 177 | nhoff += iph->ihl * 4; |
0744dd00 | 178 | |
3797d3e8 | 179 | ip_proto = iph->protocol; |
3797d3e8 | 180 | |
20a17bf6 DM |
181 | if (!dissector_uses_key(flow_dissector, |
182 | FLOW_DISSECTOR_KEY_IPV4_ADDRS)) | |
5af7fb6e | 183 | break; |
c3f83241 | 184 | |
06635a35 | 185 | key_addrs = skb_flow_dissector_target(flow_dissector, |
c3f83241 TH |
186 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, target_container); |
187 | memcpy(&key_addrs->v4addrs, &iph->saddr, | |
188 | sizeof(key_addrs->v4addrs)); | |
189 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
807e165d TH |
190 | |
191 | if (ip_is_fragment(iph)) { | |
4b36993d | 192 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
807e165d TH |
193 | |
194 | if (iph->frag_off & htons(IP_OFFSET)) { | |
195 | goto out_good; | |
196 | } else { | |
4b36993d | 197 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
807e165d TH |
198 | if (!(flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG)) |
199 | goto out_good; | |
200 | } | |
201 | } | |
202 | ||
8306b688 TH |
203 | if (flags & FLOW_DISSECTOR_F_STOP_AT_L3) |
204 | goto out_good; | |
205 | ||
0744dd00 ED |
206 | break; |
207 | } | |
2b8837ae | 208 | case htons(ETH_P_IPV6): { |
0744dd00 ED |
209 | const struct ipv6hdr *iph; |
210 | struct ipv6hdr _iph; | |
19469a87 TH |
211 | __be32 flow_label; |
212 | ||
0744dd00 | 213 | ipv6: |
690e36e7 | 214 | iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph); |
0744dd00 | 215 | if (!iph) |
a6e544b0 | 216 | goto out_bad; |
0744dd00 ED |
217 | |
218 | ip_proto = iph->nexthdr; | |
0744dd00 | 219 | nhoff += sizeof(struct ipv6hdr); |
19469a87 | 220 | |
20a17bf6 DM |
221 | if (dissector_uses_key(flow_dissector, |
222 | FLOW_DISSECTOR_KEY_IPV6_ADDRS)) { | |
b924933c JP |
223 | struct flow_dissector_key_ipv6_addrs *key_ipv6_addrs; |
224 | ||
225 | key_ipv6_addrs = skb_flow_dissector_target(flow_dissector, | |
226 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
227 | target_container); | |
5af7fb6e | 228 | |
b924933c | 229 | memcpy(key_ipv6_addrs, &iph->saddr, sizeof(*key_ipv6_addrs)); |
c3f83241 | 230 | key_control->addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; |
b924933c | 231 | } |
87ee9e52 | 232 | |
19469a87 TH |
233 | flow_label = ip6_flowlabel(iph); |
234 | if (flow_label) { | |
20a17bf6 DM |
235 | if (dissector_uses_key(flow_dissector, |
236 | FLOW_DISSECTOR_KEY_FLOW_LABEL)) { | |
87ee9e52 TH |
237 | key_tags = skb_flow_dissector_target(flow_dissector, |
238 | FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
239 | target_container); | |
240 | key_tags->flow_label = ntohl(flow_label); | |
12c227ec | 241 | } |
872b1abb TH |
242 | if (flags & FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL) |
243 | goto out_good; | |
19469a87 TH |
244 | } |
245 | ||
8306b688 TH |
246 | if (flags & FLOW_DISSECTOR_F_STOP_AT_L3) |
247 | goto out_good; | |
248 | ||
0744dd00 ED |
249 | break; |
250 | } | |
2b8837ae JP |
251 | case htons(ETH_P_8021AD): |
252 | case htons(ETH_P_8021Q): { | |
0744dd00 ED |
253 | const struct vlan_hdr *vlan; |
254 | struct vlan_hdr _vlan; | |
255 | ||
690e36e7 | 256 | vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), data, hlen, &_vlan); |
0744dd00 | 257 | if (!vlan) |
a6e544b0 | 258 | goto out_bad; |
0744dd00 | 259 | |
20a17bf6 DM |
260 | if (dissector_uses_key(flow_dissector, |
261 | FLOW_DISSECTOR_KEY_VLANID)) { | |
d34af823 TH |
262 | key_tags = skb_flow_dissector_target(flow_dissector, |
263 | FLOW_DISSECTOR_KEY_VLANID, | |
264 | target_container); | |
265 | ||
266 | key_tags->vlan_id = skb_vlan_tag_get_id(skb); | |
267 | } | |
268 | ||
0744dd00 ED |
269 | proto = vlan->h_vlan_encapsulated_proto; |
270 | nhoff += sizeof(*vlan); | |
271 | goto again; | |
272 | } | |
2b8837ae | 273 | case htons(ETH_P_PPP_SES): { |
0744dd00 ED |
274 | struct { |
275 | struct pppoe_hdr hdr; | |
276 | __be16 proto; | |
277 | } *hdr, _hdr; | |
690e36e7 | 278 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); |
0744dd00 | 279 | if (!hdr) |
a6e544b0 | 280 | goto out_bad; |
0744dd00 ED |
281 | proto = hdr->proto; |
282 | nhoff += PPPOE_SES_HLEN; | |
283 | switch (proto) { | |
2b8837ae | 284 | case htons(PPP_IP): |
0744dd00 | 285 | goto ip; |
2b8837ae | 286 | case htons(PPP_IPV6): |
0744dd00 ED |
287 | goto ipv6; |
288 | default: | |
a6e544b0 | 289 | goto out_bad; |
0744dd00 ED |
290 | } |
291 | } | |
08bfc9cb EH |
292 | case htons(ETH_P_TIPC): { |
293 | struct { | |
294 | __be32 pre[3]; | |
295 | __be32 srcnode; | |
296 | } *hdr, _hdr; | |
297 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); | |
298 | if (!hdr) | |
a6e544b0 | 299 | goto out_bad; |
06635a35 | 300 | |
20a17bf6 DM |
301 | if (dissector_uses_key(flow_dissector, |
302 | FLOW_DISSECTOR_KEY_TIPC_ADDRS)) { | |
06635a35 | 303 | key_addrs = skb_flow_dissector_target(flow_dissector, |
9f249089 | 304 | FLOW_DISSECTOR_KEY_TIPC_ADDRS, |
06635a35 | 305 | target_container); |
9f249089 TH |
306 | key_addrs->tipcaddrs.srcnode = hdr->srcnode; |
307 | key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS; | |
06635a35 | 308 | } |
a6e544b0 | 309 | goto out_good; |
08bfc9cb | 310 | } |
b3baa0fb TH |
311 | |
312 | case htons(ETH_P_MPLS_UC): | |
313 | case htons(ETH_P_MPLS_MC): { | |
314 | struct mpls_label *hdr, _hdr[2]; | |
315 | mpls: | |
316 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, | |
317 | hlen, &_hdr); | |
318 | if (!hdr) | |
a6e544b0 | 319 | goto out_bad; |
b3baa0fb | 320 | |
611d23c5 TH |
321 | if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >> |
322 | MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) { | |
20a17bf6 DM |
323 | if (dissector_uses_key(flow_dissector, |
324 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY)) { | |
b3baa0fb TH |
325 | key_keyid = skb_flow_dissector_target(flow_dissector, |
326 | FLOW_DISSECTOR_KEY_MPLS_ENTROPY, | |
327 | target_container); | |
328 | key_keyid->keyid = hdr[1].entry & | |
329 | htonl(MPLS_LS_LABEL_MASK); | |
330 | } | |
331 | ||
a6e544b0 | 332 | goto out_good; |
b3baa0fb TH |
333 | } |
334 | ||
a6e544b0 | 335 | goto out_good; |
b3baa0fb TH |
336 | } |
337 | ||
56193d1b | 338 | case htons(ETH_P_FCOE): |
42aecaa9 | 339 | key_control->thoff = (u16)(nhoff + FCOE_HEADER_LEN); |
56193d1b | 340 | /* fall through */ |
0744dd00 | 341 | default: |
a6e544b0 | 342 | goto out_bad; |
0744dd00 ED |
343 | } |
344 | ||
6a74fcf4 | 345 | ip_proto_again: |
0744dd00 ED |
346 | switch (ip_proto) { |
347 | case IPPROTO_GRE: { | |
348 | struct gre_hdr { | |
349 | __be16 flags; | |
350 | __be16 proto; | |
351 | } *hdr, _hdr; | |
352 | ||
690e36e7 | 353 | hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr); |
0744dd00 | 354 | if (!hdr) |
a6e544b0 | 355 | goto out_bad; |
0744dd00 ED |
356 | /* |
357 | * Only look inside GRE if version zero and no | |
358 | * routing | |
359 | */ | |
ce3b5355 TH |
360 | if (hdr->flags & (GRE_VERSION | GRE_ROUTING)) |
361 | break; | |
362 | ||
363 | proto = hdr->proto; | |
364 | nhoff += 4; | |
365 | if (hdr->flags & GRE_CSUM) | |
0744dd00 | 366 | nhoff += 4; |
1fdd512c TH |
367 | if (hdr->flags & GRE_KEY) { |
368 | const __be32 *keyid; | |
369 | __be32 _keyid; | |
370 | ||
371 | keyid = __skb_header_pointer(skb, nhoff, sizeof(_keyid), | |
372 | data, hlen, &_keyid); | |
373 | ||
374 | if (!keyid) | |
a6e544b0 | 375 | goto out_bad; |
1fdd512c | 376 | |
20a17bf6 DM |
377 | if (dissector_uses_key(flow_dissector, |
378 | FLOW_DISSECTOR_KEY_GRE_KEYID)) { | |
1fdd512c TH |
379 | key_keyid = skb_flow_dissector_target(flow_dissector, |
380 | FLOW_DISSECTOR_KEY_GRE_KEYID, | |
381 | target_container); | |
382 | key_keyid->keyid = *keyid; | |
383 | } | |
ce3b5355 | 384 | nhoff += 4; |
1fdd512c | 385 | } |
ce3b5355 TH |
386 | if (hdr->flags & GRE_SEQ) |
387 | nhoff += 4; | |
388 | if (proto == htons(ETH_P_TEB)) { | |
389 | const struct ethhdr *eth; | |
390 | struct ethhdr _eth; | |
391 | ||
392 | eth = __skb_header_pointer(skb, nhoff, | |
393 | sizeof(_eth), | |
394 | data, hlen, &_eth); | |
395 | if (!eth) | |
a6e544b0 | 396 | goto out_bad; |
ce3b5355 TH |
397 | proto = eth->h_proto; |
398 | nhoff += sizeof(*eth); | |
0744dd00 | 399 | } |
823b9693 | 400 | |
4b36993d | 401 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
823b9693 TH |
402 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) |
403 | goto out_good; | |
404 | ||
ce3b5355 | 405 | goto again; |
0744dd00 | 406 | } |
6a74fcf4 TH |
407 | case NEXTHDR_HOP: |
408 | case NEXTHDR_ROUTING: | |
409 | case NEXTHDR_DEST: { | |
410 | u8 _opthdr[2], *opthdr; | |
411 | ||
412 | if (proto != htons(ETH_P_IPV6)) | |
413 | break; | |
414 | ||
415 | opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr), | |
416 | data, hlen, &_opthdr); | |
1e98a0f0 | 417 | if (!opthdr) |
a6e544b0 | 418 | goto out_bad; |
6a74fcf4 | 419 | |
1e98a0f0 ED |
420 | ip_proto = opthdr[0]; |
421 | nhoff += (opthdr[1] + 1) << 3; | |
6a74fcf4 TH |
422 | |
423 | goto ip_proto_again; | |
424 | } | |
b840f28b TH |
425 | case NEXTHDR_FRAGMENT: { |
426 | struct frag_hdr _fh, *fh; | |
427 | ||
428 | if (proto != htons(ETH_P_IPV6)) | |
429 | break; | |
430 | ||
431 | fh = __skb_header_pointer(skb, nhoff, sizeof(_fh), | |
432 | data, hlen, &_fh); | |
433 | ||
434 | if (!fh) | |
435 | goto out_bad; | |
436 | ||
4b36993d | 437 | key_control->flags |= FLOW_DIS_IS_FRAGMENT; |
b840f28b TH |
438 | |
439 | nhoff += sizeof(_fh); | |
440 | ||
441 | if (!(fh->frag_off & htons(IP6_OFFSET))) { | |
4b36993d | 442 | key_control->flags |= FLOW_DIS_FIRST_FRAG; |
b840f28b TH |
443 | if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) { |
444 | ip_proto = fh->nexthdr; | |
445 | goto ip_proto_again; | |
446 | } | |
447 | } | |
448 | goto out_good; | |
449 | } | |
0744dd00 | 450 | case IPPROTO_IPIP: |
fca41895 | 451 | proto = htons(ETH_P_IP); |
823b9693 | 452 | |
4b36993d | 453 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
823b9693 TH |
454 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) |
455 | goto out_good; | |
456 | ||
fca41895 | 457 | goto ip; |
b438f940 TH |
458 | case IPPROTO_IPV6: |
459 | proto = htons(ETH_P_IPV6); | |
823b9693 | 460 | |
4b36993d | 461 | key_control->flags |= FLOW_DIS_ENCAPSULATION; |
823b9693 TH |
462 | if (flags & FLOW_DISSECTOR_F_STOP_AT_ENCAP) |
463 | goto out_good; | |
464 | ||
b438f940 | 465 | goto ipv6; |
b3baa0fb TH |
466 | case IPPROTO_MPLS: |
467 | proto = htons(ETH_P_MPLS_UC); | |
468 | goto mpls; | |
0744dd00 ED |
469 | default: |
470 | break; | |
471 | } | |
472 | ||
20a17bf6 DM |
473 | if (dissector_uses_key(flow_dissector, |
474 | FLOW_DISSECTOR_KEY_PORTS)) { | |
06635a35 JP |
475 | key_ports = skb_flow_dissector_target(flow_dissector, |
476 | FLOW_DISSECTOR_KEY_PORTS, | |
477 | target_container); | |
478 | key_ports->ports = __skb_flow_get_ports(skb, nhoff, ip_proto, | |
479 | data, hlen); | |
480 | } | |
5af7fb6e | 481 | |
a6e544b0 TH |
482 | out_good: |
483 | ret = true; | |
484 | ||
485 | out_bad: | |
486 | key_basic->n_proto = proto; | |
487 | key_basic->ip_proto = ip_proto; | |
488 | key_control->thoff = (u16)nhoff; | |
489 | ||
490 | return ret; | |
0744dd00 | 491 | } |
690e36e7 | 492 | EXPORT_SYMBOL(__skb_flow_dissect); |
441d9d32 CW |
493 | |
494 | static u32 hashrnd __read_mostly; | |
66415cf8 HFS |
495 | static __always_inline void __flow_hash_secret_init(void) |
496 | { | |
497 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
498 | } | |
499 | ||
20a17bf6 DM |
500 | static __always_inline u32 __flow_hash_words(const u32 *words, u32 length, |
501 | u32 keyval) | |
42aecaa9 TH |
502 | { |
503 | return jhash2(words, length, keyval); | |
504 | } | |
505 | ||
20a17bf6 | 506 | static inline const u32 *flow_keys_hash_start(const struct flow_keys *flow) |
66415cf8 | 507 | { |
20a17bf6 DM |
508 | const void *p = flow; |
509 | ||
42aecaa9 | 510 | BUILD_BUG_ON(FLOW_KEYS_HASH_OFFSET % sizeof(u32)); |
20a17bf6 | 511 | return (const u32 *)(p + FLOW_KEYS_HASH_OFFSET); |
42aecaa9 TH |
512 | } |
513 | ||
20a17bf6 | 514 | static inline size_t flow_keys_hash_length(const struct flow_keys *flow) |
42aecaa9 | 515 | { |
c3f83241 | 516 | size_t diff = FLOW_KEYS_HASH_OFFSET + sizeof(flow->addrs); |
42aecaa9 | 517 | BUILD_BUG_ON((sizeof(*flow) - FLOW_KEYS_HASH_OFFSET) % sizeof(u32)); |
c3f83241 TH |
518 | BUILD_BUG_ON(offsetof(typeof(*flow), addrs) != |
519 | sizeof(*flow) - sizeof(flow->addrs)); | |
520 | ||
521 | switch (flow->control.addr_type) { | |
522 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
523 | diff -= sizeof(flow->addrs.v4addrs); | |
524 | break; | |
525 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
526 | diff -= sizeof(flow->addrs.v6addrs); | |
527 | break; | |
9f249089 TH |
528 | case FLOW_DISSECTOR_KEY_TIPC_ADDRS: |
529 | diff -= sizeof(flow->addrs.tipcaddrs); | |
530 | break; | |
c3f83241 TH |
531 | } |
532 | return (sizeof(*flow) - diff) / sizeof(u32); | |
533 | } | |
534 | ||
535 | __be32 flow_get_u32_src(const struct flow_keys *flow) | |
536 | { | |
537 | switch (flow->control.addr_type) { | |
538 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
539 | return flow->addrs.v4addrs.src; | |
540 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
541 | return (__force __be32)ipv6_addr_hash( | |
542 | &flow->addrs.v6addrs.src); | |
9f249089 TH |
543 | case FLOW_DISSECTOR_KEY_TIPC_ADDRS: |
544 | return flow->addrs.tipcaddrs.srcnode; | |
c3f83241 TH |
545 | default: |
546 | return 0; | |
547 | } | |
548 | } | |
549 | EXPORT_SYMBOL(flow_get_u32_src); | |
550 | ||
551 | __be32 flow_get_u32_dst(const struct flow_keys *flow) | |
552 | { | |
553 | switch (flow->control.addr_type) { | |
554 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
555 | return flow->addrs.v4addrs.dst; | |
556 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
557 | return (__force __be32)ipv6_addr_hash( | |
558 | &flow->addrs.v6addrs.dst); | |
559 | default: | |
560 | return 0; | |
561 | } | |
562 | } | |
563 | EXPORT_SYMBOL(flow_get_u32_dst); | |
564 | ||
565 | static inline void __flow_hash_consistentify(struct flow_keys *keys) | |
566 | { | |
567 | int addr_diff, i; | |
568 | ||
569 | switch (keys->control.addr_type) { | |
570 | case FLOW_DISSECTOR_KEY_IPV4_ADDRS: | |
571 | addr_diff = (__force u32)keys->addrs.v4addrs.dst - | |
572 | (__force u32)keys->addrs.v4addrs.src; | |
573 | if ((addr_diff < 0) || | |
574 | (addr_diff == 0 && | |
575 | ((__force u16)keys->ports.dst < | |
576 | (__force u16)keys->ports.src))) { | |
577 | swap(keys->addrs.v4addrs.src, keys->addrs.v4addrs.dst); | |
578 | swap(keys->ports.src, keys->ports.dst); | |
579 | } | |
580 | break; | |
581 | case FLOW_DISSECTOR_KEY_IPV6_ADDRS: | |
582 | addr_diff = memcmp(&keys->addrs.v6addrs.dst, | |
583 | &keys->addrs.v6addrs.src, | |
584 | sizeof(keys->addrs.v6addrs.dst)); | |
585 | if ((addr_diff < 0) || | |
586 | (addr_diff == 0 && | |
587 | ((__force u16)keys->ports.dst < | |
588 | (__force u16)keys->ports.src))) { | |
589 | for (i = 0; i < 4; i++) | |
590 | swap(keys->addrs.v6addrs.src.s6_addr32[i], | |
591 | keys->addrs.v6addrs.dst.s6_addr32[i]); | |
592 | swap(keys->ports.src, keys->ports.dst); | |
593 | } | |
594 | break; | |
595 | } | |
66415cf8 HFS |
596 | } |
597 | ||
50fb7992 | 598 | static inline u32 __flow_hash_from_keys(struct flow_keys *keys, u32 keyval) |
5ed20a68 TH |
599 | { |
600 | u32 hash; | |
601 | ||
c3f83241 | 602 | __flow_hash_consistentify(keys); |
5ed20a68 | 603 | |
20a17bf6 | 604 | hash = __flow_hash_words(flow_keys_hash_start(keys), |
42aecaa9 | 605 | flow_keys_hash_length(keys), keyval); |
5ed20a68 TH |
606 | if (!hash) |
607 | hash = 1; | |
608 | ||
609 | return hash; | |
610 | } | |
611 | ||
612 | u32 flow_hash_from_keys(struct flow_keys *keys) | |
613 | { | |
50fb7992 TH |
614 | __flow_hash_secret_init(); |
615 | return __flow_hash_from_keys(keys, hashrnd); | |
5ed20a68 TH |
616 | } |
617 | EXPORT_SYMBOL(flow_hash_from_keys); | |
618 | ||
50fb7992 TH |
619 | static inline u32 ___skb_get_hash(const struct sk_buff *skb, |
620 | struct flow_keys *keys, u32 keyval) | |
621 | { | |
6db61d79 TH |
622 | skb_flow_dissect_flow_keys(skb, keys, |
623 | FLOW_DISSECTOR_F_STOP_AT_FLOW_LABEL); | |
50fb7992 TH |
624 | |
625 | return __flow_hash_from_keys(keys, keyval); | |
626 | } | |
627 | ||
2f59e1eb TH |
628 | struct _flow_keys_digest_data { |
629 | __be16 n_proto; | |
630 | u8 ip_proto; | |
631 | u8 padding; | |
632 | __be32 ports; | |
633 | __be32 src; | |
634 | __be32 dst; | |
635 | }; | |
636 | ||
637 | void make_flow_keys_digest(struct flow_keys_digest *digest, | |
638 | const struct flow_keys *flow) | |
639 | { | |
640 | struct _flow_keys_digest_data *data = | |
641 | (struct _flow_keys_digest_data *)digest; | |
642 | ||
643 | BUILD_BUG_ON(sizeof(*data) > sizeof(*digest)); | |
644 | ||
645 | memset(digest, 0, sizeof(*digest)); | |
646 | ||
06635a35 JP |
647 | data->n_proto = flow->basic.n_proto; |
648 | data->ip_proto = flow->basic.ip_proto; | |
649 | data->ports = flow->ports.ports; | |
c3f83241 TH |
650 | data->src = flow->addrs.v4addrs.src; |
651 | data->dst = flow->addrs.v4addrs.dst; | |
2f59e1eb TH |
652 | } |
653 | EXPORT_SYMBOL(make_flow_keys_digest); | |
654 | ||
d4fd3275 JP |
655 | /** |
656 | * __skb_get_hash: calculate a flow hash | |
657 | * @skb: sk_buff to calculate flow hash from | |
658 | * | |
659 | * This function calculates a flow hash based on src/dst addresses | |
61b905da TH |
660 | * and src/dst port numbers. Sets hash in skb to non-zero hash value |
661 | * on success, zero indicates no valid hash. Also, sets l4_hash in skb | |
441d9d32 CW |
662 | * if hash is a canonical 4-tuple hash over transport ports. |
663 | */ | |
3958afa1 | 664 | void __skb_get_hash(struct sk_buff *skb) |
441d9d32 CW |
665 | { |
666 | struct flow_keys keys; | |
441d9d32 | 667 | |
50fb7992 TH |
668 | __flow_hash_secret_init(); |
669 | ||
6db61d79 | 670 | __skb_set_sw_hash(skb, ___skb_get_hash(skb, &keys, hashrnd), |
bcc83839 | 671 | flow_keys_have_l4(&keys)); |
441d9d32 | 672 | } |
3958afa1 | 673 | EXPORT_SYMBOL(__skb_get_hash); |
441d9d32 | 674 | |
50fb7992 TH |
675 | __u32 skb_get_hash_perturb(const struct sk_buff *skb, u32 perturb) |
676 | { | |
677 | struct flow_keys keys; | |
678 | ||
679 | return ___skb_get_hash(skb, &keys, perturb); | |
680 | } | |
681 | EXPORT_SYMBOL(skb_get_hash_perturb); | |
682 | ||
20a17bf6 | 683 | __u32 __skb_get_hash_flowi6(struct sk_buff *skb, const struct flowi6 *fl6) |
f70ea018 TH |
684 | { |
685 | struct flow_keys keys; | |
686 | ||
687 | memset(&keys, 0, sizeof(keys)); | |
688 | ||
689 | memcpy(&keys.addrs.v6addrs.src, &fl6->saddr, | |
690 | sizeof(keys.addrs.v6addrs.src)); | |
691 | memcpy(&keys.addrs.v6addrs.dst, &fl6->daddr, | |
692 | sizeof(keys.addrs.v6addrs.dst)); | |
693 | keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
694 | keys.ports.src = fl6->fl6_sport; | |
695 | keys.ports.dst = fl6->fl6_dport; | |
696 | keys.keyid.keyid = fl6->fl6_gre_key; | |
697 | keys.tags.flow_label = (__force u32)fl6->flowlabel; | |
698 | keys.basic.ip_proto = fl6->flowi6_proto; | |
699 | ||
bcc83839 TH |
700 | __skb_set_sw_hash(skb, flow_hash_from_keys(&keys), |
701 | flow_keys_have_l4(&keys)); | |
f70ea018 TH |
702 | |
703 | return skb->hash; | |
704 | } | |
705 | EXPORT_SYMBOL(__skb_get_hash_flowi6); | |
706 | ||
20a17bf6 | 707 | __u32 __skb_get_hash_flowi4(struct sk_buff *skb, const struct flowi4 *fl4) |
f70ea018 TH |
708 | { |
709 | struct flow_keys keys; | |
710 | ||
711 | memset(&keys, 0, sizeof(keys)); | |
712 | ||
713 | keys.addrs.v4addrs.src = fl4->saddr; | |
714 | keys.addrs.v4addrs.dst = fl4->daddr; | |
715 | keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
716 | keys.ports.src = fl4->fl4_sport; | |
717 | keys.ports.dst = fl4->fl4_dport; | |
718 | keys.keyid.keyid = fl4->fl4_gre_key; | |
719 | keys.basic.ip_proto = fl4->flowi4_proto; | |
720 | ||
bcc83839 TH |
721 | __skb_set_sw_hash(skb, flow_hash_from_keys(&keys), |
722 | flow_keys_have_l4(&keys)); | |
f70ea018 TH |
723 | |
724 | return skb->hash; | |
725 | } | |
726 | EXPORT_SYMBOL(__skb_get_hash_flowi4); | |
727 | ||
56193d1b AD |
728 | u32 __skb_get_poff(const struct sk_buff *skb, void *data, |
729 | const struct flow_keys *keys, int hlen) | |
f77668dc | 730 | { |
42aecaa9 | 731 | u32 poff = keys->control.thoff; |
f77668dc | 732 | |
06635a35 | 733 | switch (keys->basic.ip_proto) { |
f77668dc | 734 | case IPPROTO_TCP: { |
5af7fb6e AD |
735 | /* access doff as u8 to avoid unaligned access */ |
736 | const u8 *doff; | |
737 | u8 _doff; | |
f77668dc | 738 | |
5af7fb6e AD |
739 | doff = __skb_header_pointer(skb, poff + 12, sizeof(_doff), |
740 | data, hlen, &_doff); | |
741 | if (!doff) | |
f77668dc DB |
742 | return poff; |
743 | ||
5af7fb6e | 744 | poff += max_t(u32, sizeof(struct tcphdr), (*doff & 0xF0) >> 2); |
f77668dc DB |
745 | break; |
746 | } | |
747 | case IPPROTO_UDP: | |
748 | case IPPROTO_UDPLITE: | |
749 | poff += sizeof(struct udphdr); | |
750 | break; | |
751 | /* For the rest, we do not really care about header | |
752 | * extensions at this point for now. | |
753 | */ | |
754 | case IPPROTO_ICMP: | |
755 | poff += sizeof(struct icmphdr); | |
756 | break; | |
757 | case IPPROTO_ICMPV6: | |
758 | poff += sizeof(struct icmp6hdr); | |
759 | break; | |
760 | case IPPROTO_IGMP: | |
761 | poff += sizeof(struct igmphdr); | |
762 | break; | |
763 | case IPPROTO_DCCP: | |
764 | poff += sizeof(struct dccp_hdr); | |
765 | break; | |
766 | case IPPROTO_SCTP: | |
767 | poff += sizeof(struct sctphdr); | |
768 | break; | |
769 | } | |
770 | ||
771 | return poff; | |
772 | } | |
773 | ||
0db89b8b JP |
774 | /** |
775 | * skb_get_poff - get the offset to the payload | |
776 | * @skb: sk_buff to get the payload offset from | |
777 | * | |
778 | * The function will get the offset to the payload as far as it could | |
779 | * be dissected. The main user is currently BPF, so that we can dynamically | |
56193d1b AD |
780 | * truncate packets without needing to push actual payload to the user |
781 | * space and can analyze headers only, instead. | |
782 | */ | |
783 | u32 skb_get_poff(const struct sk_buff *skb) | |
784 | { | |
785 | struct flow_keys keys; | |
786 | ||
cd79a238 | 787 | if (!skb_flow_dissect_flow_keys(skb, &keys, 0)) |
56193d1b AD |
788 | return 0; |
789 | ||
790 | return __skb_get_poff(skb, skb->data, &keys, skb_headlen(skb)); | |
791 | } | |
06635a35 | 792 | |
20a17bf6 | 793 | __u32 __get_hash_from_flowi6(const struct flowi6 *fl6, struct flow_keys *keys) |
a17ace95 DM |
794 | { |
795 | memset(keys, 0, sizeof(*keys)); | |
796 | ||
797 | memcpy(&keys->addrs.v6addrs.src, &fl6->saddr, | |
798 | sizeof(keys->addrs.v6addrs.src)); | |
799 | memcpy(&keys->addrs.v6addrs.dst, &fl6->daddr, | |
800 | sizeof(keys->addrs.v6addrs.dst)); | |
801 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
802 | keys->ports.src = fl6->fl6_sport; | |
803 | keys->ports.dst = fl6->fl6_dport; | |
804 | keys->keyid.keyid = fl6->fl6_gre_key; | |
805 | keys->tags.flow_label = (__force u32)fl6->flowlabel; | |
806 | keys->basic.ip_proto = fl6->flowi6_proto; | |
807 | ||
808 | return flow_hash_from_keys(keys); | |
809 | } | |
810 | EXPORT_SYMBOL(__get_hash_from_flowi6); | |
811 | ||
20a17bf6 | 812 | __u32 __get_hash_from_flowi4(const struct flowi4 *fl4, struct flow_keys *keys) |
a17ace95 DM |
813 | { |
814 | memset(keys, 0, sizeof(*keys)); | |
815 | ||
816 | keys->addrs.v4addrs.src = fl4->saddr; | |
817 | keys->addrs.v4addrs.dst = fl4->daddr; | |
818 | keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
819 | keys->ports.src = fl4->fl4_sport; | |
820 | keys->ports.dst = fl4->fl4_dport; | |
821 | keys->keyid.keyid = fl4->fl4_gre_key; | |
822 | keys->basic.ip_proto = fl4->flowi4_proto; | |
823 | ||
824 | return flow_hash_from_keys(keys); | |
825 | } | |
826 | EXPORT_SYMBOL(__get_hash_from_flowi4); | |
827 | ||
06635a35 | 828 | static const struct flow_dissector_key flow_keys_dissector_keys[] = { |
42aecaa9 TH |
829 | { |
830 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
831 | .offset = offsetof(struct flow_keys, control), | |
832 | }, | |
06635a35 JP |
833 | { |
834 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
835 | .offset = offsetof(struct flow_keys, basic), | |
836 | }, | |
837 | { | |
838 | .key_id = FLOW_DISSECTOR_KEY_IPV4_ADDRS, | |
c3f83241 TH |
839 | .offset = offsetof(struct flow_keys, addrs.v4addrs), |
840 | }, | |
841 | { | |
842 | .key_id = FLOW_DISSECTOR_KEY_IPV6_ADDRS, | |
843 | .offset = offsetof(struct flow_keys, addrs.v6addrs), | |
06635a35 | 844 | }, |
9f249089 TH |
845 | { |
846 | .key_id = FLOW_DISSECTOR_KEY_TIPC_ADDRS, | |
847 | .offset = offsetof(struct flow_keys, addrs.tipcaddrs), | |
848 | }, | |
06635a35 JP |
849 | { |
850 | .key_id = FLOW_DISSECTOR_KEY_PORTS, | |
851 | .offset = offsetof(struct flow_keys, ports), | |
852 | }, | |
d34af823 TH |
853 | { |
854 | .key_id = FLOW_DISSECTOR_KEY_VLANID, | |
855 | .offset = offsetof(struct flow_keys, tags), | |
856 | }, | |
87ee9e52 TH |
857 | { |
858 | .key_id = FLOW_DISSECTOR_KEY_FLOW_LABEL, | |
859 | .offset = offsetof(struct flow_keys, tags), | |
860 | }, | |
1fdd512c TH |
861 | { |
862 | .key_id = FLOW_DISSECTOR_KEY_GRE_KEYID, | |
863 | .offset = offsetof(struct flow_keys, keyid), | |
864 | }, | |
06635a35 JP |
865 | }; |
866 | ||
867 | static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = { | |
42aecaa9 TH |
868 | { |
869 | .key_id = FLOW_DISSECTOR_KEY_CONTROL, | |
870 | .offset = offsetof(struct flow_keys, control), | |
871 | }, | |
06635a35 JP |
872 | { |
873 | .key_id = FLOW_DISSECTOR_KEY_BASIC, | |
874 | .offset = offsetof(struct flow_keys, basic), | |
875 | }, | |
876 | }; | |
877 | ||
878 | struct flow_dissector flow_keys_dissector __read_mostly; | |
879 | EXPORT_SYMBOL(flow_keys_dissector); | |
880 | ||
881 | struct flow_dissector flow_keys_buf_dissector __read_mostly; | |
882 | ||
883 | static int __init init_default_flow_dissectors(void) | |
884 | { | |
885 | skb_flow_dissector_init(&flow_keys_dissector, | |
886 | flow_keys_dissector_keys, | |
887 | ARRAY_SIZE(flow_keys_dissector_keys)); | |
888 | skb_flow_dissector_init(&flow_keys_buf_dissector, | |
889 | flow_keys_buf_dissector_keys, | |
890 | ARRAY_SIZE(flow_keys_buf_dissector_keys)); | |
891 | return 0; | |
892 | } | |
893 | ||
894 | late_initcall_sync(init_default_flow_dissectors); |